ofman



L OFMAN;

COOKING STOVE. I

APPLIICATION HLED MAR. 4. 1919..

1 06,435 Patented June 10, 1919.

3 SHEETS-SHEET I.

jaw @iww J. OFMAN.

COOKING STOVE.

APPLICATION FILED MAR. 4. I9l9.

1,36,35, Fl 9 2 Patented June 10, 1919.

3 SHEETSSHEET 2. 23'? A A OFMAN.

COOKING STOVE.

APPLICATION FILED MAR. 4, 1919A Patented June 10; 1919.

3 SHEETSSHEET 3 7 Specification of Letters Patent.

:iAcoB OiElVJQAN, or ROTTERDAM, NETHERLANDS.

COOKING-STOVE.

Application filed March 4, 1919. Serial N 0. 280,658.

To all whom itvmay concern Be it known that I, JACOB OFMAN, teacher,subject of the Queen of the Netherlands, residing at Rotterdam, theNetherlands, have invented certain new and useful Improvements inCooking-Stoves, of which the following is. a specification.

The present invention relates to cooking stoves, the stove according tomy invention requiring less fuel for a given capacity of food to beprepared than the stoves heretofore known.

According to the present invention, the fire-place arranged underneaththe oven space is provided with a rotary slide for equally dividing thecombustion gases, conduits being provided for these gases Which passthrough or near the oven space and are connected above the latter with achimney flue. Preferably this rotary slide forms a part of a rotarycylinder forming a jacket around the furnace or a part thereof, thiscylinder being provided with holes which may be made to register withholes provided in an outer jacket. In this way the combustion gases areequallydivided over the smoke conduits connected with the holes arrangedin said outer jacket, independent of the fact. that the draft wholly orpartly exerts its influence. Therotation of the" inner jacket or thefurnace may also be utilized for opening or closing the stoke hole. Aseparate fire door is hence superfluous.

A cooking hole in the bottom of the oven arranged centrally above thefurnace is wholly exposed to the action of the narrow flames inconsequence of the equal exit of combustion gases in differentdirections through the rotary slide. In ordinary cooking stoves on thecontrary the flames exit together in an inclined direction so that but asmall part of the bottom of the cooking pan is in direct contact withthe gases. The equal division of the combustion gases on a certainnumber of fire holes in thus exceedingly advantageous for a quick andhence economical heating of the cooking pan.

Apart from the equal division of heat on the oven the rotary slide hasthe following eifect.

If the slide holes are wide open and if thus the draft exerts its fullinfluence the combustion takes place past the slide holes, thecombustion space having thus a great capacity. Of course the fire musthave a corresponding intensity. If on the contrary the passages arereduced, the combustion space is limitedto the space situated directlyabove the fire. With a small fire a much more effective combustion isobtained in this way than in case the fire were maintained in a largespace. The rotary slide contributes thus to a great extent to aneconomical fuel consumption. This advantage is still increased by thenatural insulating and preheating of air obtained by means of the doublewall consisting of the rotary slide and the jacket.

The combination of the rotary stoke hole and the rotary slide obligesthe user of the cooking stove to learn the function of the rotary 'slidein consequence of which the latter is effectively used. The slide canneither be neglected nor immobilized by dirt. The contrary case toooften presents itself with cooking apparatus whose complication renderstheir use incomprehensible to most users. The vertical slot between therotary slideand the jacket and the repeated relative displacement ofthese parts during the stoking process prevents these parts frombecoming immobilized by grit.

The equal division of heat over the oven space allows of keeping boilingfood in boiling condition in any part of said space. There may beprovided adjustable rings on standards for receiving pans or othercooking utensils one above the other so that it is possible to arrangewithin a space of rather restricted dimensions a relatively great numberof pans which may be separately controlled.

The accompanying drawings represent one embodiment of the cooking stoveaccording to my invention.

Figure 1 represents a front view and Fig. 2 a vertical section of thecooking stove,

Fig. 3 is a horizontal cross-section on the fire holes, seen from aboveand without the furnace.

Fig. 4 is a cross section of the same kind, the different partsoccupying a different position with regard to one another, the furnacebeing shown without the grate.

Fig. 5 is a horizontal cross section of the stove seen from above.

The grate 6 is arranged within an ordinary furnace 7 the latter beinsuspended within a cylinder 8. This cylin er contains in its lower partan ash tray 9, and its bottom rests by means of an extension 10 in aPatented J une 10, 1919.

rotatable manner on a bearing plate '11.

-to register with fire holes 13 in an outer cylinder or jacket 14. Theposition of the holes 12 with regard to the holes 13 may be adjusted byrotating the cylinder .8, the lat ter being provided for this purposewith a handle 15 which may be caught with a poker or a fire hook. Apointer provided on said handle and marks on the jacket 14 indicate thegrade of regulation (Fig. 1).

The cylinder 8 is provided with a stoke hole arranged opposite the feedopening 16 of the furnace and the mantle 14; is provided with a stokehole 17. By rotating the cylinder both stoke holes can be made toregister. hen the fuel is introduced some of the fire holes 12 and 13still present such a passage as to maintain a suliicient draft.

Fig. 4- shows the wayin which the feed opening 16 is brought in frontlying then opposite the stoke hole 17 (compare Fig. 1). The flange ofthe furnace 7 is provided with recesses 18 so that a small quantity ofair can pass along the outside of the furnace and join the combustiongases through the openings 18. This very hot air produces an intensesmoke combustion and adds moreover to the heating of the oven 19. Thelatter is provided with a. double wall and with a door 20 having a vaporhole 21. The oven is heated by the fiues22 connectedwith the holes 13and communicating at the upper part of the oven with the chimney piece23.

Copies of this patent may be obtained for five cents each, byadtlressing the Commissioner of Patents,

It is obvious that with a cooking stove of" larger dimensions a greaternumber of cook ing holes may be provided in the bottom of the oven spaceThese holes are then swept by the gases or flames on their way from thefire holes 13 to the fire tubes 22.

I claim as my invention? 1. In a cooking stove, the combination with thechimney, of an oven, a fire-place underneath the same, axn'umber of openfines extending along thesaid oven'and connected with the chimney abovethe oven, a cylindrical jacket depending from the bottom of said oven,and a rotatable cylinder surrounding said fire-place and havingapertures adapted to register with similar apertures in the saidcylindrical jacket upon the rotation of the said cylinder.

2. A cooking stove, as specified in claim 1,

comprising a rotary cylinder provided with a stoke-hole ad: pted toregistei 'j withay stoke-hole in said jacket upon the rotation of saidcylinder through :a certain angle, preferably of 90 degrees.

3. A cooking stove, as specified in eiaim 2 comprising a flangeprovided'on the upper end of the fireplace contained in said rotarycylinder, the said flange having recesses so arranged as to permitheated air to join the ases of combustion. a i whereofI aifixjmyslgnature.

In testimony Washington, D. G.

